Leonard schevenell



(N0 Model.)

L. SGHEVENELL.

SAW SHARPENER.

No. 348,143. Patented Aug. 24, 1886.

imam-pf N. PETERS. PhaM-lflhognphar. Wnhinglnn. IZC.

UNITED STATES PATENT @Frrcn.

LEONARD SOHEVENELL, OF ATHENS, GEORGIA, ASSIGNOR OF ONE-HALF TO THOMASBAILEY, OF SAME PLACE.

SAW-SHARPENER.

SPECIFICATION forming part of Letters Patent No. 348,143, dated August24:, 1886.

Application filed June 11, 1886.

To all whom it may concern.-

Be it known that I, LEONARD SOHEVENELL,

a citizen of the United States, and residing at Athens, county ofClarke, State of Georgia, have invented certain new and usefulImprovements in Saw Sharpeners and Gummer s, of which the following is aspecification.

This invention relates to that class of saw sharpeners and gummers inWhichthe operations of sharpening and gumming are performedsimultaneously; and it consists in combining with a revolving file forsharpening and gumming the saw a novel means of operating the same, andalso of imparting to the said file a rocking motion at right angles toits plane of revolution.

In the drawings, Figure 1 represents a side elevation of my improveddevice, showing it 1n operative relation with a saw, and Fig. 2 an endelevation of the same, showing the driving mechanism and itsconnections.

The revolving sharpening and gumming file B, I prefer should bedisk-like in shape,

- with the edge beveled, so as to be inserted easily into the throat ofthe tooth being operated upon. The said disk B is mounted in thebifurcated end 0 of a rock-shaft, D, journaled in the frame of themachine, the said frame being designated in the drawings by A. The saidshaft D has imparted to it a rocking movement at right angles to theplane of the revolution of the disk B, and a longitudinal movement inits bearings.

In order to impart the said rocking movement to the shaft D, I providethe same, near the rear end, with a pendent rod or arm, E, secured tosaid shaft by a collar or sleeve, F, in which is a groove for thereception of a spline or feather, G, on the shaft. The arm E carries atits lower end a roller, H. engaging with a cam-surface, I, on "one sideof a drive-wheel, K, mounted on a shaft, L, the latter being journaledin the frame A, and operated by a crank, M, or by other suitable means.The roller on the arm E being maintained in constant contact with thecam-surface I by a spring, N, Fig. 2, the said arm is oscillatedthroughan are equal to the relative rise and fall of the saidcam-surface, and causes the shaft D and the disk-file carried thereby torock, while a simultaneous longitudinal Serial No. 204.861. (No model.)

movement of the shaft is permitted, as the spline thereon will movefreely in the grooved sleeve, from which the arm E depends. The arm E isprevented from moving longitudi- 55 nally with the shaft by means ofsuitable bearings attached to the frame A-such, for instance, as shownat Oor the arm may embrace the drive-wheel shaft, or both means 7, maybe employed. 6o

I do not wish to confine myself to the depending arm for rocking theshaft, as an arm may project above the shaft, as shown in dotted lines,Fig. 2, or laterally from it; also various forms of cams may be used inplace of 6 the one shown, whereby the shaft may be caused to rock morethan once during the revolution of the drive-wheel. Neither do I wish toconfine myself particularly to a cam for causing the shaft to rock, asthere are other known connections for producing the same movement. Thedisk-file B is revolved by means of a shaft, 1?, suitably journaled inbearings secured to the frame A, and flexibly conneeted to the spindleof said disk by any suitable meanssuch as a coil-spring, Rwhereby thedisk may be revolved in a plane substantial] y at right angles to thesaid shaft P, and may also be rocked and mounted in movable bearings. tothe drive-wheel by means of a bevel-pinion,

S, meshing with bevel gear'teeth on the periphery of the said drivewheel.

In connection with the mechanism for sharpening and gumming the saw Iemploy a 8 5 means for advancing the saw a distance equal to the spacebetween the points of the teeth.

I prefer that the operation of the said means should be automatic andconnected to the main driving mechanism, and I have shown one means bywhich such operation may be performed; but I do not wish to confinemyself to such means, and do not broadly claim the same as of myinvention.

To a suitable point on the frame A, I pivotally secure an upright lever,T, the upper end being bifurcated, or otherwise formed, to embrace therock-shaft between collars U, adjustablysecured to said shaft. The lowerend of the lever T carries a rod or strip, V, suit- [00 ably guided inthe frame, and pivotally connected at one end to the said lever, theother I prefer to connect the shaft 1 8o end of said rod being formedinto a head adapted to engage one or more of the teeth of the saw to beoperated upon.

Secured to the lever T coincident with pivotpoint thereof is an arm orrod, WV, extending from said lever across the face of the drivewheel K,on which are one or more pins or studs, X, adapted to engage and depressthe free end of said arm W, thereby moving the lever T on its pivot, theupper end moving rearward and carrying the shaft D and the file B withit, while the lower end of the lever moves forward, causing the rod V toengage one of the teeth in the saw Y and move it a distance equal to thespace between the points of the saw-teeth.

Any suitable means may be employed to advance the file to the toothpresented and to simultaneously retract the rod V; but I prefer toemploy a spring, Z, secured at one end to the frame A and at the otherend to a collar on the shaft D, said collar engaging with a collar, A,fixed on the said shaft. The spring is expanded as the shaft is movedrearward, and when the saidshaft is released the spring will advance itto the saw, the shaft carrying the upper end of the lever T forward, andthereby retracting the rod V.

As the saw must be moved to present the succeeding teeth, and still beheld firmly during the operation of sharpening and gumming, I provideclamping-arms B, (one only being shown,) projecting forward and upwardfrom the front of the frame A, and each terminating in a clamping-head,C. These arms B are placed in close relation, so as to grasp the sawbetween them, and have sufficient elasticity to hold the saw firmly andstill permit the said saw to be moved. I prefer that the contact-surfaces of the said armsbe formed of wooden blocks inserted in theheads 0, as shown at D, and that the arms be of sufiicient length tocarry the contact-surfaces on a level with or above the file B. I preferwooden bloeks,as they will hold the saw firmly and still permit it to bemoved.

Inoperating the apparatus I first place it so that the arms B willembrace and clamp the saw, and the file B will rest in the throat of atooth. Then by rotating the drive-wheel I cause the file B to revolvewith considerable speed by means of the shaft P and connections. At thesame time the file B is caused to rock by means'of the pendent arm E,connected to the shaft D and contacting with the cam-surface on thedrive-wheel. When the drive- -wheel has been moved sufficiently far tocause one of the pins X thereon to engage with the arm W, the lever T ismoved on its pivot, the upper end retracting the shaft D, and therebycarrying the file B from the saw, and the lower end advancing the rod Yuntil it engages a tooth and moves the saw, which is supported on itsarbor, or in any other suitable manner, a distance equal to the spacebetween the teeth. The pin X then slowly releases the arm V, and thespring Z causes a reverse movement of the said parts, advancing the fileB to the saw and retracting the rod V, which falls by gravity onto theincline of the next succeeding tooth, preparatory to again moving thesaw. I

The apparatus is automatic in its operation, and the sharpening, gumming out of the tooth. and the rounding of the same are performedsimultaneously. The springs, connected with the retracting and rockingof the shaft D and the flexible or spring connection R, impart anelasticity to the file in its operation not obtained when fixed or rigidbearings are employed, thus permitting the speed of the cut of the fileto be normal, and obviating the forcing of the same.

In order to regulate the length of the are through which the pendent armE moves, I may make the roller H adjustable on the arm, and by moving itto or from the axis of the cam impart the desired length of oscillationto said arm.

The apparatus I have described is designed more particularly fortreating gin-saws, but may be adapted to gum and sharpen ordinarywood'cutting saws.

Without limiting myself to the precise construction and arrangement ofparts shown, I claim 1. A rotating file combined with a supportingrock-shaft, and means, substantially as described, for rocking saidshaft, as and for the purpose specified.

2. A rotating file combined with a supporting-shaft, and means forrocking said shaft, consisting of an arm, E, on said shaft, and arotating cam engaging said arm, substantially as described.

3. The combination, with a driving mechanism, of a rotating file, amovable support for the same operated by said mechanism, and

flexible connections between the said driving mechanism and the file,whereby the said file IIO is rotated and its support operated simultaarock-shaft having a longitudinal movement,

and means, substantially as described, for rocking and moving the saidshaft, substantially as described.

7. The combination, with a rotating file, of

a rock-shaft supporting the same and having a longitudinal movement,means, substantially as described, for rocking and moving the shaft, anda flexible connection between the driving mechanism and the said file,substantially as described.

8. The combination, witha rotating file, of a rock-shaft supporting thesame and having a longitudinal movement, means, substantially asdescribed, for rocking and moving said shaft, and a saw-advancingmechanism moving simultaneously with the longitudinal movement of thesaid shaft, substantially as described.

9. The combination, with a rotating file, of a rock-shaft supporting thesame and having alongitudinal movement, means, substantially asdescribed, for rocking and moving said shaft, a saw-advancing mechanismmoving simultaneously with the longitudinal movement of the shaft, and aflexible connection between the file and the driving mechanism, wherebythe file is rotated, substantially as described.

10. The combination, with a rotating file, of a rock-shaft supportingthe same, an arm at tached to said shaft by means of a sleeve or collarthrough which the shaft is adapted to move longitudinally, and a camengaging said arm to rock the shaft, substantially as described.

11. The combination, with a rotating file, of a rock-shaft supportingthe same, an arm attached to the shaft, a drive-wheel having on one sidea cam engaging the said arm, and also provided with gear-teeth, a shaftcarrying a bevel-pinion engaging said gear-teeth, and a flexibleconnection between the said shaft and the file, substantially asdescribed.

12. A saw sharpener and gummer consisting of a rotating file, arock-shaft supporting the same, a cam engaging an arm on the rockshaftfor rocking the shaft, a drive-wheel carrying the cam. a shaft havingflexible conncction with the file and carrying a pinion meshing withgear-teeth on the drive-wheel, a lever connected to the rock-shaft tomove the same longitudinally, a rod connected to the lever and adaptedto engage the saw to move the same, and an arm connected to the lever,and

engaging pins or studs on the drive-wheel and 45 operating thelever,substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

LEONARD SCHEVENE LL.

\Vitnesses:

W. B. JACKSON, T. H. NIOKERSON.

